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(No Model.) 2 Sheets-Sheet 1.

- D. B. OLIVER.

ROLLS. No. 397,563., Patented Feb.-12, 1889..

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(No Model.) 2 Sheets-Sheet 2.

D. B. OLIVER.

ROLLS.

No. 397,563. Patented Feb. 12, 1889.

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, rolls removed from the housings.

lUniTEn STaTEs PATENT @EETEE.

DAVID B. OLIVER, OF ALLEGHENY, PENNSYLVANIA.

ROLL.

SPECIFICATION forming part of Letters Patent No. 39?,563, dated February12, 1889.

Application filed April 26, 1888. Serial No. 271,969. (No model.)

T0 all whom it may concern.-

Be it known that 1, DAVID B. OLIVER, of Allegheny, in the county of.-\lllegheny and State of Pennsylvania, have invented a new and usefulImprovement in Rolls; and I do hereby declare the following to be afull, clear, and exact description thereof, reference being bad to theaccompanying drawings, in which Figure 1 is a front view of my improvedFig. 2 is an endview of the rolls and their housings. Fig. 3 is a topplan view of the housings. Fig. i is a side view of the top of thehousings.

Like symbols of reference indicate like parts in each.

I11 rolling skelp-iron slabs for covers for plate-iron piles and similarmaterial it has been usual to employ grooved two-high rolls, the toproll of which is balanced, and is provided with adjusting-screws bywhich it is vertically movable in the housings. The metal is passedbetween the rolls, and after setting down the top roll the metal ispassed back by heave-up hooks over the top roll, and successive passesor reductions in a single direction are given to it until it reduced tothe desired thickness. The partin gs between the tongue of the top rolland the groove of the bottom roll cause a tin or flash on the piece,which makes it necessary, for the purpose of effacing the fiu,1oturn thepiece over at each pass, so that the top of the slab shall be at the.bottom of the groove at the next pass. Passing the iron back over therolls and reversing it at each pass are laborious operations, requiringthe presence of additional men at the rolls, and therefore increasingthe cost of production.

As distinguished from the prior state of the art as thus set forth, myinvention consists in a three-high set of tongued and grooved rolls suchas are shown in Fig. l. of the drawings-- which are adjustable to varythe sizes of the passes, of which one of the rolls is fixed, and theother two are suitably balanced, and the top roll is movable verticallyby means of adjustin 'screws. In the use of these rolls the iron isfirst passed between the bottom and middle rolls, then raised by asuitable feedtable and passed back between the top and middle rolls, andso on until the desired reduction is obtained, the rolls at each passbeing adjusted to diminish the size of the opening between them. By thismethod of rolling it is not necessary to turn the metal slab to reducethe fin, because the side of the slab which is next the middle roll andon which the fin is formed at one pass is at the next pass at the baseof the groove and farthest from the middle roll. These rolls are ofgreat utility, not only because they obviate the necessity for passingthe metal back over the rolls at each pass, as in the two high rolls,but also because they prevent the formation of fins on the metal withoutneed of reversing itat each pass, and because with a set of three-highrolls having a single pass above and below I. am enabled to do the samework as with a set of non-adjustable rolls of much greater length andhavinganumber of passes or grooves.

In rolling slabs or plates of considerable Width the labor of turningthe metal over at each pass is so great as to render the use of two-highrolls dit'ficnlt and expensive, if not impracticable. With the use ofthree-high tongued and grooved adjustable rolls I am enabled to rollmetal of great width and weight, which, by reason of the confinement ofthe metal in the grooves, is compact and even at the edges. Avertically-1iftingfeed-table with driven feed-rollers may beconveniently used in connection with the rolls.

As compared with the use of plain rolls, the iron is produced morecheaply, because the edges are regular and do not have to be trimmedoff.

Rolls constructed on. this principle may be arranged in a variety ofways for example, the bearings of the middle roll may be fixed, the topand bottom rolls being adjustable to and from it; or the bearings of thetop roll may be fixed; themiddle and bottom rolls be ing adj ustable, orthe bearings of the bottom roll may be fixed and the top and middlerolls adjustable. I have shown the lastnamed arrangement in thedrawings, in which 2, 3, and 4 are the top, middle, and bottom rolls,respectively, the top and bot-tom rolls being grooved, and the middleroll having a tongue which iits within these grooves. The bearings ofthe bottom roll, 4, are stationary, and the bearings of the middle rollare roll, and when the slab is to be passed bel mounted 011 a yoke, 2%,which connects the upright rods 5 with the pistons of hydrauliccylinders 6, a pump, 25, being provided for furnishing water, which actson the under sides of the pistons and tends to raise the bearingsot IWhen the slab is to be passed bctween the middle and bottom rolls, thehyl the roll.

draulic pistons are raised so as to elevate the middle roll against thejournals of the top of the rolls and resting at their lower ends 011 thebearings 01' the top roll. These screws are turned by means of pinions13, keyed thereto, and connected by an intermediate gear-wheel, 14,which is fitted with a feather and spline on a rotary vertical shaft,15.The shaft 15 is driven by a gear-wheel, 16, which is fixed thereto, andwhich meshes with a pinion, 17, on a vertical shaft, 18. This shaft 18is driven from a primary driving-shaft, 19, by

0 means of intermeshing beveled pinions 20.

The screws are connected by ayoke, 22, which encircles them, and whichis supported by collars 23. hen thus arranged, it is obvious that therotation of the primary shaft will drive the screws, and will thus raiseor lower the bearings of the top roll accordingly as the shaft is drivenin one direction or the other, the force to raise the roll beingsupplied by a suitable counter-balance.

\Vhen the rolls are in operation, at each pass of the metal between themthe adj usting-screws are turned so as to depress the bearings of thetop roll and to lessen the distance between the top and bottom rolls andto eitect a corresponding reduction of the 5 metal.

By the use 01' the term adjustable rolls in this specification I meanthree-high rolls, which are in practice adjusted throughout theoperation of rolling, so that the metal rolled can be reduced in thickness at each successive pass in the same grooves.

1.1 and 12 are adj ustin g-screws ari was The rolls may be very greatlymodified in the con struetion and arrangement of the parts by which theyare adjusted in the housings, since I do not limit myself to thespecific form which I have shown and described.

I am aware that a three-high mill having plain rolls has heretofore beenprovided with guide-collars and grooves at the ends to prevent lateralplay of the rolls, and do not claim the same; but

What I claim is 1. In a three-high mill, the combination of thehousings, a roll set in stationary bearings in the housin two rolls setin vertically-mow able bearings therein, a litter acting on one of thevertically-movable rolls to raise the same in the housings, and adjListing-screws connected with the bearings of the other of said movablerolls, said. rolls being tongued and grooved to form working andreducing passes, having the tongues oppositely placed inthe reversepasses, whereby the plate or slab to be rolled is continuously reduced,and the flash or fin formed at one pass is et'faced at the reverse passwithout reversing such, plate or slab, substantially as and for thepurposes described.

2. In a three-high mill, the combination of the housings, a roll set instationary bearings in the housings, two rolls set in verticallymovablebearings therein, hydraulic cylinders, the piston-rods of which act onthe bearings of one of the vertically-movable rolls to raise the same inthe housings, and adjustingscrews connected with the bearings of theother of said movable rolls, said rolls being tongued and grooved toform working and reducing passes, having the tongues oppositely placedin the reverse passes, whereby the plate or slab to be rolled iscontinuously re duce il,and the tlash orfin formed at onepass is effacedat the reverse pass without reversing such plate or slab, substantiallyas and for the purposes described.

In testimony whereof I have hereunto set my hand this 5th day of April,A. D. 1888.

DAVID B. OLIVER.

\Yitnesses:

THOMAS W. BAKnwELL, W. B. CoRwIN.

